Market analysis
Calculators
Interactive educational tools for the course concepts: margin and fair price, expected value, Kelly fraction, odds converter
Analysis, not advice. The calculators' output is a mathematical illustration for the course chapters, not a betting recommendation, stake suggestion or financial advice. Every decision is your own responsibility.
Margin and fair price
The bookmaker's margin (overround) built into the quoted odds, and the fair probabilities after removing it using the proportional devig method.
Expected value (EV)
If your own estimated probability differs from the one implied by the odds, that gap can be quantified: EV = probability × odds − 1.
Kelly fraction
The Kelly criterion gives the theoretical fraction that maximises bankroll growth; the formula's output is a mathematical illustration, not a stake recommendation.
Odds converter
Enter the odds in any format and get the other two, plus the implied probability.